Hitachi RAS-E10H2 - Drive Circuit Operation

1.
P
o
wer cir
cuit
This
circuit
is
to
con
ve
rt
the
po
we
r
from
AC
w
hich
is
pro
vided
from
the
ter
minal
A
and
B
to
DC
v
oltag
e
And
produces
an
AC
current
which
does
not
e
xceed
the
har
monic
amplitude
limit
of
the
IEC61000-3-2.
When
the
compressor
is
stopped,
the
AC
v
oltage
becomes
about
300
V
and
while
the
compressor
operate
s,
it is about 280
V.
Main pa
rt
s
(1)
DB2
The DB2 rectifies the
AC
v
oltage
.
The
possib
le
causes
f
or
the
DB2
f
ailure
are
as
fo
llo
ws
. T
he
15
A
fuse
ma
y
may ma
be
bl
ow
n
out
or
the
IP
M
f
or
the
main
P.
W.
B.
m
ay
h
av
e
a
f
ailure
.
In
such
a
case
,
chec
k
the
15
A
fuse
f
or
bl
ow
out
and
replace
the main
P.
W.
B.
if necessar
y.
(2)
DB3, L1, C023 and L2
The DB3, L1, C023 and L2 shape
wave
fo
rm
of the input current.
When
the
current
ru
ns
through
the
L1
is
tak
en
f
or
I1
and
the
current
ru
ns
through
the
L2
is
tak
en
fo
r
I2
as
sho
wn
in
Fig.
1
-2,
I1
becomes
an
input
current
to
the
capacitor
which
peak
va
lue
w
as
cr
ushe
d
by
the
L1
and
I2
becomes
a
resonance
current
which
causes
the
LC
resonance
using
the
L2
an
d
C023.
By
combining
the
I1
and
I2,
the
input
current
from
the
main
po
wer
shapes
a
wa
ve
fo
rm
s
ho
wn
in
the
r
ight
side
of
Fig.
1
-3,
indicating
that
the
wave
fo
rm
is
similar
to
sine
wa
ve
.
T
he
more
the
waveform is similar to the sine wave, the lower the harmonic current becomes.
If
the
C023
has
any
failure,
the
protection
unit
activates
and
the
C023
in
open
mode.
In
such
a
case
,
replace the failed parts.
+
I
1
I
2
I
S
I
1
I
2
L1
L2
DB3
C023
Fig. 1-1
Fig. 1-2
Fig. 1-3
ＧＲ
ＡＹ
（Ｓ
２）
ＯＲ
ＡＮ
ＧＥ
（Ｓ
２）
Ｃ０
２
３
Ｒ００８
＋
Ｃ０
＋
Ｃ０
２
１
ＹＥ
ＬＬ
ＯＷ
ＢＬ
ＵＥ
Ｌ
２
Ｌ
１
１
Ｌ
１
ＴＡ
Ｂ０
５
ＴＡ
Ｂ
１
１
Ｌ
１
ＴＡ
Ｂ
１
１
Ｌ
ＴＡ
Ｌ
ＴＡ
２
Ｂ
２
Ｂ
ＤＢ
３
+
−
（３
−Ｇ
）
Ｑ
Ｑ
+
−
−
MAIN P.W.B.
MODEL RAC-E10H2
Input
Voltage
0V
0V
0V
Voltage
Smoothed
Voltage
Fig. 1-4
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